Geometry, based on UTME (Unified Tertiary Matriculation Examination) standards, covers fundamental concepts of shapes, sizes, positions, and properties of space. It's divided into two main branches: Plane Geometry: This deals with two-dimensional figures that lie on a flat surface. Key topics include: Lines and Angles: Types of lines (parallel, perpendicular, intersecting), types of angles (acute, obtuse, right, straight, reflex, complementary, supplementary, vertically opposite, alternate, corresponding). Properties of angles formed by parallel lines and a transversal. Triangles: Types of triangles (equilateral, isosceles, scalene, right-angled, acute-angled, obtuse-angled). Properties of angles and sides. Congruence and similarity of triangles. Pythagoras theorem in right-angled triangles. Area of triangles. Quadrilaterals: Types of quadrilaterals (squares, rectangles, rhombuses, parallelograms, trapeziums, kites). Properties of their sides, angles, and diagonals. Area of quadrilaterals. Polygons: Definition of polygons, classification by number of sides (pentagon, hexagon, etc.). Properties of interior and exterior angles. Regular polygons. Area of regular polygons. Circles: Parts of a circle (radius, diameter, chord, tangent, secant, arc, sector, segment). Properties of angles subtended by arcs at the center and circumference. Angles in a semicircle. Cyclic quadrilaterals. Area and circumference of a circle. Solid Geometry (Mensuration): This deals with three-dimensional objects. Key topics include: Basic Solids: Cubes, cuboids (rectangular prisms), cylinders, cones, spheres. Properties: Identifying faces, edges, and vertices. Formulas: Calculating surface area and volume of these solids. For example, the volume of a cylinder is πr²h, and its surface area is 2πrh + 2πr². The volume of a sphere is (4/3)πr³, and its surface area is 4πr². UTME geometry questions often involve applying these properties and formulas to solve problems, which may include finding unknown lengths, angles, areas, or volumes, and often require logical deduction and spatial reasoning.